If you have an older model laserjet there is no adjustment for the display brightness. Either there is dirt on the inside of the display which can be fixed by taking the control panel apart, or the display is failing.

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To increase the brightness, either swipe up from the bottom to get the control panel, and increase the brightness there (slide the slider just below the 5 circles to the right) or go into Settings > Display and Brightness> Increase brightness using slider. You can also turn on the auto brightness from here if it is off, or turn it off if it is not working like you want it to.

Sounds like your keybinding/hotkey combo is not doing its job. (or your bulb in the display is going out)

You can open up Control Panel and adjust brightness from there.

Step 1
Click "Start ' Control Panel ' Hardware and Sound ' Power Options" to open the Power Options window.
Step 2
Click and drag the bottom "Screen Brightness" slider to the right to increase screen brightness and to the left to decrease it. Making this adjustment changes the brightness level only for the current power source; if you change power sources, the screen brightness may change again.
Step 3
Click "Change Plan Settings" on whichever power plan is currently selected.
Step 4
Click and drag the "Adjust Plan Brightness" slider to the right to increase brightness for each of the power sources, such as "On Battery" or "Plugged In." If you want high-precision numeric control, you need to access the advanced settings.
Step 5
Click "Change Advanced Power Settings."
Step 6
Click "+" next to "Display" and then "Display Brightness" to expand these options.
Step 7
Click "On Battery" and enter a percentage in the field provided. Choosing "100" will set the screen to maximum brightness; any other brightness will be a percentage of the maximum brightness. To increase the brightness, make sure the number you enter is higher than the current value.
Step 8
Click "Plugged In" and set its brightness percentage.
Step 9
Click "Apply" and then "OK" to close the Advanced Settings window.
Step 10
Click "Save Changes" to save any changes you made on the Edit Plan Settings page. If you only make changes in the Advanced Settings page, the Save Changes button will be grayed out. If that's the case, just click "Cancel."

Normally, on the keyboard of your netbook, there is a "Fn" key next to the bottom left "Ctrl" key.
after you finish booting up and have the screen veiw, press and hold the "Fn" key, then at the top there are a row of "F' keys, usually the F6 key is the key you would press to increase the brightness of your display. Each time you press the key the brightness should increase, if you press it pass the maximum brightness it will go back to a low brightness and then increase in brightness each time you press the "F6" key.

Remember, you have to hold down the "Fn" key as you press and release the "F6" key.

Examine the keyboard. There should be a symbol on most of the function keys (F1, F2, etc.). Look for one that looks like a sun or lightbulb, either with an arrow pointing up or with the sun/lighbulb filled in. Hold the 'Fn' key, and tap the up/bright sun/lightbulb key a few times. The screen should increase in brightness.

If you cannot find the specified keys, you may be able to adjust brightness from inside Windows. Right click on the battery icon in the taskbar and open 'power options'. Look for a sun and moon with a sliding bar between them. You might also be able to adjust brightness by customizing your desktop (right click on the desktop and look for the proper menu).

Step 1
Press "Menu" on your LCD's display panel (usually below the screen). Various display options will be shown on the screen.
Step 2Select brightness from the options. This is usually indicated by a sun. Use the "+" and "-" buttons on your display panel to increase or decrease brightness.
Step 3Select contrast from the options. This is usually indicated by an oval half black and half white. Use the "+" and "-" buttons on your display panel to increase or decrease contrast.